As far as I understand, Nordström's second theory of gravitation is a mathematically self-consistent theory for gravitation, and the only way to decide between

As far as I understand, Nordström's second theory of gravitation is a mathematically self-consistent theory for gravitation, and the only way to decide between it and Einstein's theory was by comparing to observations. https://en.wikipedia.org/wiki/Nordstr%C3%B6m%27s_theory_of_gravitation https://en.wikipedia.org/wiki/Nordstr%C3%B6m%27s_theory_of_g...